The sessile drop method for immunohistochemical processing of unmounted sections of nervous tissue.

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Abstract
A novel method for the immunohistochemical processing of free-floating tissue sections is described. Sections are immersed within drops of solution arranged on a hydrophobic surface. The procedure consists of sequentially suctioning away one fluid drop and replacing it by another, while the section remains in place. The technique permits easy testing of different antiserum dilutions, comparisons among different immunohistochemical protocols, and comparison of different antisera on serial tissue sections. Comparison is made to processing mounted sections.

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